fs/9p/vfs_dir.c

   1 /*
   2  * linux/fs/9p/vfs_dir.c
   3  *
   4  * This file contains vfs directory ops for the 9P2000 protocol.
   5  *
   6  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
   7  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
   8  *
   9  *  This program is free software; you can redistribute it and/or modify
  10  *  it under the terms of the GNU General Public License version 2
  11  *  as published by the Free Software Foundation.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to:
  20  *  Free Software Foundation
  21  *  51 Franklin Street, Fifth Floor
  22  *  Boston, MA  02111-1301  USA
  23  *
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/errno.h>
  28 #include <linux/fs.h>
  29 #include <linux/file.h>
  30 #include <linux/stat.h>
  31 #include <linux/string.h>
  32 #include <linux/sched.h>
  33 #include <linux/inet.h>
  34 #include <linux/idr.h>
  35 #include <net/9p/9p.h>
  36 #include <net/9p/client.h>
  37
  38 #include "v9fs.h"
  39 #include "v9fs_vfs.h"
  40 #include "fid.h"
  41
  42 /**
  43  * dt_type - return file type
  44  * @mistat: mistat structure
  45  *
  46  */
  47
  48 static inline int dt_type(struct p9_stat *mistat)
  49 {
  50         unsigned long perm = mistat->mode;
  51         int rettype = DT_REG;
  52
  53         if (perm & P9_DMDIR)
  54                 rettype = DT_DIR;
  55         if (perm & P9_DMSYMLINK)
  56                 rettype = DT_LNK;
  57
  58         return rettype;
  59 }
  60
  61 /**
  62  * v9fs_dir_readdir - read a directory
  63  * @filep: opened file structure
  64  * @dirent: directory structure ???
  65  * @filldir: function to populate directory structure ???
  66  *
  67  */
  68
  69 static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
  70 {
  71         int over;
  72         struct p9_fid *fid;
  73         struct v9fs_session_info *v9ses;
  74         struct inode *inode;
  75         struct p9_stat *st;
  76
  77         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", filp->f_path.dentry->d_name.name);
  78         inode = filp->f_path.dentry->d_inode;
  79         v9ses = v9fs_inode2v9ses(inode);
  80         fid = filp->private_data;
  81         while ((st = p9_client_dirread(fid, filp->f_pos)) != NULL) {
  82                 if (IS_ERR(st))
  83                         return PTR_ERR(st);
  84
  85                 over = filldir(dirent, st->name.str, st->name.len, filp->f_pos,
  86                         v9fs_qid2ino(&st->qid), dt_type(st));
  87
  88                 if (over)
  89                         break;
  90
  91                 filp->f_pos += st->size;
  92                 kfree(st);
  93                 st = NULL;
  94         }
  95
  96         kfree(st);
  97         return 0;
  98 }
  99
 100
 101 /**
 102  * v9fs_dir_release - close a directory
 103  * @inode: inode of the directory
 104  * @filp: file pointer to a directory
 105  *
 106  */
 107
 108 int v9fs_dir_release(struct inode *inode, struct file *filp)
 109 {
 110         struct p9_fid *fid;
 111
 112         fid = filp->private_data;
 113         P9_DPRINTK(P9_DEBUG_VFS,
 114                         "inode: %p filp: %p fid: %d\n", inode, filp, fid->fid);
 115         filemap_write_and_wait(inode->i_mapping);
 116         p9_client_clunk(fid);
 117         return 0;
 118 }
 119
 120 const struct file_operations v9fs_dir_operations = {
 121         .read = generic_read_dir,
 122         .readdir = v9fs_dir_readdir,
 123         .open = v9fs_file_open,
 124         .release = v9fs_dir_release,
 125 };